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G. P. ROSEBOOM. Machine for Grooving Pipes.

No. 230,064. Patentd July 13, 1880.

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v m w UNITED STATES PATENT OFFICE.

GARRET P. ROSEBOOM, OF AUBURN, NEW YORK, ASSIGNOR OF ONE-HALF OF HIS RIGHT TO CHARLES S. TROVVBRIDGE, OF SAME PLACE.

-MACH|NE FOR GROOVING PIPES.

SPECIFICATION forming part of Letters Patent No. 230,064, dated July 13,1880.

Application filed J une 10, 1880. (No model.)

To all whom it may concern Be it known that I, GARRET P. RosEnooM, of the city of Auburn, in the county of Cayuga and State of N ew York, have invented new and useful Improvements in Machines for Grooving Pipes, of which the following is a specification, reference being had to the accompanying drawings.

This invention. relates to a machine for impressing or bending screw-threads upon pipes made of sheet-iron, tin, and other sheet metal, and more especially to that class of threadingmachines which contain a cylindrical die provided with a peripheral screw-thread, upon which the end of the. pipe to be threaded is placed, and a circular die, which depresses the metal into the screw-thread of the cylindrical die, thereby forminga screw-thread 011 the pipe.

The object of this invention is to simplify the construction of this class of machines and to render the operation thereof more certain and reliable; and it consists in providing the shaft of the threaded cylindrical die with a screw-thread working in a threaded bearing, and combining these parts with a cylindrical die having no movement in the line of its axis and receiving a positive rotary motion by suitable means; also in giving the circular die a greater peripheral speed than the cylindrical die, whereby the dies are better enabled to pass over the longitudinal seam of the pipe, as will be hereinafter fully set forth.

In the accompanying drawings, Figure l is a sectional elevation of myimproved machine. Fig. 2 is an end elevation thereof. Fig. 3 is a sectional elevation, on an enlarged scale, of the upper portion of one of the side frames of the machine and connecting parts. Fig. 4 is a cross-section, on an enlarged scale, in line mm, Fig. 1.

Like letters of reference designate like parts in each of the figures.

A A represent the upright side frames of the machine, connected at their lower ends by a supporting-base, B, and at their upper ends by a cap or bridge piece, 0.

D represents the cylindrical die, provided with a screw-thread in its periphery, and secured to the end of a horizontal shaft, d, which extends through and is supported in both side frames, A A.

0 represents a screw-thread formed in that portion of the shaft (1 which extends through the side frame A, which latter is provided with a threaded bearing, f, in which the thread 6 of the shaft (1' works. The pitch of the thread 6 is the same as that of the thread on the cylindrical die D, so that each revolution of the shaft will impart to the cylindrical die a rectilinear movement in the direction of its axis equal to the pitch of the screw-thread formed thereon, thereby retaining the dies in their proper relative position during the forward and backward movement of the dies.

g represents a sleeve, which is fitted on that portion of the shaft 61 which extends through the side frame A, so that the shaft can move longitudinally within the sleeve g.

h is a set-screw secured in the sleeve g and projecting into a groove, '5, on the shaft d, whereby the rotary motion of the sleeve 9 is transmitted to the shaft d.

The sleeve 9 rotates in a bearing formed in the side frame A, and carries at its outer end a gear-wheel, J.

K represents the circular die arranged above the threaded cylindrical die D and secured to one end of a horizontal shaft, 1, which is arranged parallel with the shaft at and turns in bearin gs M M. The latter slide between vertical ways a in the side frames, A A, of the machine, and are raised and lowered by means of vertical screws 0, which are attached with their lower ends to the bearings M, and which work in the threaded openings in the ends of 8 5 the cap-piece G, and are provided with handwheels at their upper ends.

P represents a gear-wheel secured to the opposite end of the horizontal shaft 1, so as to mesh with the wheel J mounted on the shaft d. 0

Q is a hand-crank secured to the wheel P, for rotating the dies.

The two gear-wheels J and P are made of the same size, or thereabout, and the diameter of the circular die K is made twice as large 5 as the diameter of the cylindrical die, or there about, whereby the peripheral velocity of the circular die is made much greater than that of the cylindrical die, and the circular die is better enabled to pass over the seam of the pipe, which forms an obstruction and occasion- Y ally causes the pipe to slip on the threaded die in threadingmachincs as heretofore constructed.

Upon placing the end of the pipe to be threaded upon the threaded die D and forcing the circular die down upon the pipe by means of the screws 0 the metal is depressed into the depressed portions of the screw-thread on the cylindrical die. By turning the crank in the proper direction the dies are rotated and the threaded die draws the pipe under the circular die, which latter depresses the metal into the threads of the cylindrical die and forms the screw-thread on the pipe in an obvious manner.

The dies D and K and the gear-wheels J and P are secured to their respective shafts in such manner that they can be readily removed and replaced by corresponding parts of difl'erent sizes, according to the size of the pipe to be threaded.

I claim as my invention- 1. In a machine for forming screw-threads on sheet-metal pipes, the combination, with a cylindrical die, D, constructed with a peripheral screw-thread and secured to a rotating shaft, d, which is provided with a screw-thread, 0, working in a threaded bearing, f, of a circular die, K, rotating in the same plane with the cylindrical die and having no motion in the line of its axis, and means whereby a positive rotary motion is imparted to both dies, substantially as set forth.

2. In a machinefor forming screw-threads on sheet-metal pipes, the combination, with a rotating cylindrical die, constructed with a peripheral screw-thread, and means whereby the cylindrical die is positively moved in a line with its axis, of a circular die rotating in the same plane with the cylindrical die and having no motion in the line of its axis, and means whereby the circular die is rotated with greater peripheral speed than the cylindrical die, substantially as set forth.

GARRET P. ROSEBOOM.

\Vitnesses:

JNo. J. BONNER, Enw. J. BRADY. 

